Exchange Vows to Trim Data Loophole

The parent company of the Chicago Mercantile Exchange vowed to shrink to "as close to zero as possible" the time advantage some investors gain from seeing trading data before the rest of the market.

Wednesday's announcement was part of a response by CME Group Inc. to a page-one article in The Wall Street Journal that said high-speed traders are using a hidden facet of the exchange's computer system to get a jump start of one to 10 milliseconds on the direction of prices for crude oil, corn and other commodities.